JP2001149676A - Buttonhole stitch sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a buttonhole stitch sewing machine forming buttonhole stitches to easily form hole stitches without loosening of yarn or stitch disorder. SOLUTION: The buttonhole stitch sewing machine forms hole stitches in accordance with the control of a control system 100. A CPU board 54 which the control system 100 includes controls a cloth-cutting solenoid value 64, an upper shaft servomotor 47, an X-pulse motor 44, Y-pulse motor 45 and a θ-pulse motor 46 based on data preset through input operations performed on an operation panel 55, so as to execute either a front knife drive by which after a button hole is formed by a cloth cutting knife, stitches are formed in a linear portion and a bar tacking portion, or a rear knife drive by which after stitches are formed in the linear portion and the bar tacking portion, a buttonhole is formed by the cloth cutting knife, or an intermediate knife drive by which after stitches are formed in the linear portion, a buttonhole is formed by the cloth cutting knife and stitches are thereafter formed in the bar tacking portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buttonhole overlock sewing machine for forming a buttonhole overlock stitch.

[0002]

2. Description of the Related Art Generally, a buttonhole seam is shown in FIG.
As shown in the figure, the eyelet,
It is formed by performing three kinds of sewing of a straight line portion and a straight bar (straight bar tacking) portion. The buttonhole overlock sewing as shown in FIG. 6 has hitherto been formed by using a buttonhole overlock sewing machine provided with a scalpel to form a cut portion and sew as a series of steps.

[0003] In the buttonhole buttonhole stitching, two types of methods have been used so far, a leading knife drive and a rear knife drive. The tip knife drive is a method in which a cut portion is formed in a workpiece with a scalpel, and then the peripheral edge of the cut portion is overlock-stitched. The rear knife drive is a method of forming a cut with a knife after sewing a straight line portion, an eyelet portion, and a straight bar portion.

Further, in the conventional buttonhole overlock sewing, a buttonhole sewing machine provided with a cloth opening device for widening a cut portion so that the cloth does not sag and does not interfere with sewing when sewing an eyelet portion or a straight portion. Was sometimes used.

[0005]

However, in the case of performing the first knife drive in the buttonhole provided with the above cloth opening device, when the straight bar portion is sewn in a state where the cut portion is widened by the cloth opening device. However, after sewing, there is a problem that distortion is likely to occur near the straight bar portion. Further, when sewing is performed by driving a rear knife, sewing is performed while leaving a space for forming a cut portion with a knife in advance when sewing a linear portion, an eyelet portion, and a straight bar portion. For this reason, sewing cannot be performed so as to straddle the edge of the cut portion. In particular, since the straight bar portion does not straddle the edge of the cut portion, there is a problem that fraying easily occurs.

[0006] For this reason, after forming the cut portion, the straight portion, and the eyelet portion, only the straight bar portion may be sewn with another sewing machine. However, since more labor is required, work efficiency is reduced. There was a problem.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a buttonhole overlock sewing machine which can easily form a buttonhole overlock stitch without fraying of a thread or disturbance of sewing.

[0008]

According to a first aspect of the present invention, at least one of right and left straight portions and a bar tack formed at one end of both straight portions are electrically controlled. In a buttonhole overlock sewing machine forming a buttonhole overlock stitch consisting of a part and forming a buttonhole between the two linear parts by a cloth cutting knife (7), after forming a seam on the two linear parts, the cloth A control means for forming the buttonhole with a cutting knife and thereafter forming a seam at the bar-tacking portion (for example, the CPU shown in FIG. 4)
A substrate 54) is provided.

According to the first aspect of the present invention, when the buttonhole buttonhole stitch and the buttonhole are formed, the control means forms the linear portion seam, and then the buttonhole is formed with a cloth cutting knife. After that, the seam of the bar-tacking portion is formed. Therefore, since the straight portion is formed before the button hole is formed, there is no possibility that the straight portion may be distorted.In addition, since the bar-tacking portion is formed after the button hole is formed, the straight portion is formed so as to straddle the edge of the button hole. The seam of the bar-tacking part can be formed. For this reason, there is no fraying or distortion,
Beautiful buttonhole seams can be easily formed.

According to a second aspect of the present invention, in the buttonhole overlocking machine according to the first aspect, the buttonhole overlocking machine opens and closes the cloth in a direction perpendicular to the buttonhole formed by the cloth cutting knife. Means (21),
The control means is a cloth opening control means for forming a seam in the bar-tacking portion after the cloth is closed by the cloth opening means (for example, C which performs the processing shown in step S27 of FIG. 8).
PU substrate 54).

According to the second aspect of the present invention, the buttonhole overlock sewing machine according to the first aspect includes cloth opening means for opening and closing the cloth in a direction perpendicular to the buttonhole, and the cloth opening means closes the cloth. After the state, the seam of the bar-tacking portion is formed. Therefore, after the cloth is opened by the cloth opening means to form the seam of the linear portion and the eyelet portion, when the seam of the bar-tacking portion is formed, the cloth is in the closed state and the bar-tacking portion is in the closed state. There is no risk of distortion in the seam of the part. For this reason, a more beautiful buttonhole stitch can be easily formed.

According to a third aspect of the present invention, in the buttonhole buttonhole sewing machine according to the first aspect, the control means forms a stitch on the straight portion and the bar-tacking portion after the buttonhole is formed by the cloth cutting knife. A knife drive to generate a button hole by the cloth cutting knife after forming a seam on the both straight portions and the bar tacking portion; and a cloth knife after forming the seam to the both straight portions. A knife drive order setting means for setting any one of an intermediate knife drive for forming a buttonhole and thereafter forming a seam in the bar-tacking portion (for example, a CPU board for performing the processing shown in steps S47 to S56 in FIG. 9) 54) a bar-tacking setting means (for example, a CPU board 54 for performing the processing shown in step S43 in FIG. 9) for setting whether or not to form a seam in the bar-tacking portion. If the bar tacking is not set by the bar tacking setting means, and if the intermediate knife drive is set by the knife sequence setting means, the rear knife drive is automatically set and the straight line is set. After the formation of the buttonhole overlock stitch, a non-coincidence setting control means for driving the cloth cutting knife to form the buttonhole (for example, the CPU board 54 performing the process shown in step S55 in FIG. 9) is provided. Was adopted.

According to the third aspect of the present invention, in the buttonhole overlocking machine according to the first aspect, after the buttonhole is formed by the cloth cutting knife, a leading knife drive for forming a seam in the linear portion and the bar-tacking portion, and After the seam is formed in the bar and the bar-tacking part, a button hole is generated by the cloth cutting knife after forming the button hole with the cloth cutting knife. Since either the intermediate knife drive can be set, a beautiful buttonhole stitch can be easily formed by setting a desired knife drive timing in advance.

Further, it is possible to set whether or not to form a seam in the bar-tacking portion, and to set the seam not to be formed in the bar-tacking portion in spite of the setting of the intermediate knife drive, The driving operation is performed. That is, when the seam is not formed at the bar-tacking part in the intermediate knife drive,
The specific operation is the same as the operation of the rear knife drive. For this reason, if the operation is performed as the post knife driving, the button hole can be formed quickly without interrupting the work flow, rather than generating an error due to the setting that does not match. Therefore, even if a setting that does not match due to a mistake or the like is performed, the work can be advanced promptly.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 9 show an embodiment of an industrial sewing machine to which the present invention is applied. Hereinafter, with reference to the drawings, an embodiment of a buttonhole sewing machine provided with a cloth opening device (hereinafter, abbreviated as a buttonhole sewing machine) will be described. The buttonhole overlock sewing machine according to the present embodiment is a sewing machine that performs overlocking of a buttonhole having an eyelet portion.

First, the schematic configuration of the buttonhole sewing machine will be briefly described with reference to FIG. Sewing machine frame 1
Has a substantially rectangular box-shaped bed portion 2 provided with an arm portion 3 extending forward from an upper rear portion thereof, and a bottom cover 4 is attached to a lower portion of the bed portion 2.
A needle bar 6 on which a sewing needle 5 is attached is provided at the tip of the arm 3.
The bed portion 2 is provided directly below the needle bar 6 and is actuated in synchronization with the vertical movement of the needle bar 6 to cooperate with the sewing needle 5. A louver (not shown) for forming a seam on a sewing product is provided. Further, the needle bar 6 and the looper are configured to integrally rotate around the needle bar 6 in a clockwise direction or a counterclockwise direction as viewed from the upper surface of the needle bar 6.

Further, a cloth cutting knife 7 is provided on the arm 3.
Is provided so as to be able to move up and down, and the bed portion 2 is provided with a knife receiving stand (not shown). In the cloth cutting knife 7, an eyelet-shaped notch can be formed in the workpiece. The cloth cutting knife 7 includes, for example, an air cylinder, an air hose that connects the air cylinder to an air supply source (not shown) such as a compressor, and a cloth cutting electromagnetic valve 64 (FIG. 4) that controls air supply from the air hose to the air cylinder. The sewing machine is driven by a driving device including a cutting device and the like, and cuts a sewn product by an operation of an air cylinder accompanying an opening and closing operation of the cloth cutting electromagnetic valve 64.

In FIG. 1, reference numeral 8 denotes a cloth presser. The cloth presser 8 presses a sewn object against a cloth receiving plate 11 provided on a feed base 10, and in this state, the eyelet The feed base 10 is moved in accordance with the shape, and overlock sewing is sequentially performed on the periphery of the eyelet hole. The feed base 10 is moved by feed base moving means 12 provided below and in the bed 2.

The mechanism for operating the presser foot 8 will now be described. As shown in FIG. 2, an arm 13 having the presser foot 8 at its tip is rotatably supported on a cloth receiving plate 11 via a shaft 13a. The cloth receiving plate 1 is provided at the base end thereof.
A ⊂-shaped receiving arm portion 14 is formed to extend to the back side of the cloth receiving plate 11 through the hole 11a formed in the first receiving portion.
A shaft 15 on which a link 15 extends to the left and right
A pin 17 attached to one end of the receiving arm 14 is connected to the receiving arm 14. In this case, the receiving arm 14 is slidable in the left-right direction with respect to the pin 17. Further, a pin 18 attached to the other end of the link 15 is connected via a joint 20 to a rod 19 a of a pressing driving body 19 formed of an air cylinder provided on the feed base 10. Then, in the mechanism having the above configuration, when the rod 19a is extended,
The presser foot 8 rotates downward, and the work to be sewn is pressed against the cloth receiving plate 11 by the presser foot 8.

The pressing driving body 19 includes an air cylinder, an air hose for connecting the air cylinder to an air supply source such as a compressor (not shown), and a pressing solenoid valve for controlling air supply from the air hose to the air cylinder. 62 (see FIG. 4) and the like.
Is adapted to expand and contract with the opening and closing operation of the holding electromagnetic valve 62.

Next, a cloth opening device provided in the buttonhole overlock sewing machine according to the present invention will be described with reference to FIG. FIG. 3 is a plan view showing the cloth opening device. As shown in the figure, the feed table 10 is provided with a pair of cloth receiving plates 11 on both sides of the vertical moving path of the cloth cutting knife 7 so as to approach or separate from the vertical moving path. 3 is provided so as to be movable in the directions (the directions of arrows A and B), but in FIG.
Omitted to indicate. The cloth opening means 21 is provided on each of the left and right sides of the cloth cutting knife 7 with the vertical movement path interposed therebetween. By moving the pair of cloth receiving plates 11 in the left and right directions, the cloth receiving means 21 is opened. Board 11,
The notch of the sewing object, which has been cut by the cloth cutting knife 7 and held by the cloth cutting knife 7, is opened and closed.

The cloth opening means 21 is provided symmetrically on the feed table 10, so that the right cloth opening means 21 will be described here, and the description of the left cloth opening means 21 will be omitted. That is, the cloth opening means 2 on the right side
1 is a front-rear direction (arrow C in FIG. 3) orthogonal to the direction of movement of the cloth receiving plate 11 (the direction of arrows A and B in FIG. 3).
A cam plate 22 movably provided in the direction D), an extending arm 70 formed to extend rightward slightly to the front of the center of the cam plate 22, and the cloth receiving plate 11. And a rail plate 24 that moves in the left-right direction in conjunction with the forward and backward movement of the cam plate 22.

The cloth receiving plate 11 has two holes 11 in front and rear.
b, 11b are formed, and cloth-opening receiving pins 25, 25 provided at the end portions of the rail plates 24, 24 are inserted into the holes 11b, 11b, whereby the cloth receiving plate 11 and the rail plates 24, 24 are inserted. And are connected. The rail plate 24
Are elongated in the left and right direction, and long holes 24a, 24a are formed in both left and right ends thereof in the left and right direction. Step screws 26, 26 are inserted into the long holes 24a, 24a, and By screwing the screws 26, 26 into the feed base 10, the rail plate 24 is attached to the feed base 10 so as to be linearly movable in the left-right direction. A roller 27 is rotatably mounted on the lower surface of the right end of each rail plate 24 by a step screw 28.

The cam plate 22 is moved back and forth (in the directions of arrows C and D).
A long hole 22a, 22a is formed at the front and rear ends thereof.
a, 22a are inserted through the step screws 29, 29, and the step screws 2
The screw 9 and 29 are screwed into the feed plate 10 so that the cam plate 2
Numeral 2 is attached to the feed base 10 so as to be linearly movable in the front-rear direction. The cam plate 22 is disposed below the rail plates 24, 24.
Each of the inclined surfaces 30, 30 is formed. The inclined surfaces 30, 30 gradually incline leftward toward the rear, and the rollers 27, 27 come into contact with the inclined surfaces 30, 30, as described below.

That is, springs 31, 31 are provided on the feed table 10 at positions in front of the rail plates 24, 24.
Are mounted by screw steps 32, 32, and the springs 31, 31 are provided with pins 3 provided on the rail plates 24, 24.
3, 33. Then, the pins 33, 33
Are urged leftward (in the direction of arrow A) by the springs 31, 31, whereby the rail plates 24, 24 are urged leftward. Therefore, the rollers 27, 27 attached to the rail plates 24, 24 are in contact with the inclined surfaces 30, 30 with the cam plate 22 urged to the left by the urging force of the springs 31, 31. .

The extension arm 70 extends to the right slightly above the center of the cam plate 22 as described above. The distal end of the extension arm 70 is rotatably connected to the distal end of the piston rod 36 a of the air cylinder 36 via a knuckle 37. Therefore, the cam plate 22 moves back and forth through the extension arm 70 by extending and contracting the piston rod 36a back and forth, whereby the cloth receiving plate 11 moves left and right through the rail plates 24 and 24. It is supposed to.

When the cam plate 22 moves back and forth, the rollers 27 and 27 relatively roll on the inclined surfaces 30 and 30 and move in the left-right direction.
24 moves left and right. That is, the rail plates 24, 24 move left and right in conjunction with the front and rear movements of the cam plates 24, 24. The air cylinder 36 is connected to an air supply source such as a compressor (not shown) via a cloth opening solenoid valve 63 (see FIG. 4), which will be described later, and an air hose.
When the cloth opening electromagnetic valve 63 opens and closes under the control of the CPU board 54 of 00, the piston rod 36a operates.

When the extension arm 70 moves by the piston rod 36a of the air cylinder 36, the cam plate 22 linearly moves back and forth, and the linear movement of the cam plate 22 back and forth causes the rail plates 24 and 24 to tilt. Face 30,3
It is configured to linearly move left and right through the 0 and the rollers 27 and 27.

Next, the operation of the cloth opening means 21 having the above structure will be described. First, as shown in FIG. 3, the piston rod 36a of the air cylinder 36 is at the retracted position. In this state, the cam plate 22 is located rearward (in the direction of arrow D), and the rollers 27, 27 are inclined. The rail plates 24, 24 are located on the upper side (in the direction of arrow B) of the rails 30, 30, and the springs 31, 3
The cloth receiving plate 11 is located on the opening side (the position where the cloth receiving plate 11 is farthest away from the vertical movement path of the cloth cutting knife) contrary to the urging force of No. 1.

The air cylinder 36 is operated from the above initial state, and its piston rod 36a is moved by the arrow C in FIG.
Stretch in the direction. Then, the extension arm 70 moves forward (in the direction of arrow C) with the movement of the knuckle 37,
The cam plate 22 linearly moves forward (in the direction of arrow C), whereby the rollers 27, 27 attached to the rail plates 24, 24 relatively move the inclined surfaces 30, 30 by the biasing force of the springs 31, 31. Go down while rolling. Roller 27, 2
7 moves down the inclined surfaces 30, 30, the rail plates 24, 24 move linearly to the left (in the direction of arrow A), and the rail plates 24, 2
4, the cloth receiving plate 11 connected to the cloth opening receiving pins 25 moves to the left. The feeder 10
Similarly, the cloth receiving plate 11 on the left side moves rightward.
Therefore, the cut of the sewing object held by the cloth receiving plates 11, 11 is closed. In opening the cut of the sewing object, the cloth opening means 21 is operated in the reverse direction.

As described above, in the buttonhole sewing machine of the present embodiment, the operation of the air cylinder 36 causes the cam plate 2 to move.
2 moves in the front-rear direction, the rail plates 24, 24 move in the left-right direction in conjunction with the front-rear movement of the cam plate 22,
Thus, the cloth receiving plate 11 connected to the rail plates 24, 24 moves in the left-right direction. That is, the cloth receiving plate 11
Moves only in the left-right direction with the left-right movement of the rail plates 24, 24, and does not involve the back-and-forth movement as in the related art, so that the sewing object does not shift when the cloth is opened.

Next, a control system 100 of the buttonhole sewing machine according to the present embodiment will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of the control system 100. As shown in FIG. 4, the control system 100 includes a circuit 40 built in the tip of the arm 3, ie, the head of the buttonhole sewing machine. Electrical box 50 installed on a sewing machine table of a buttonhole sewing machine, a holding electromagnetic valve 62 connected to the electrical box 50, a cloth opening electromagnetic valve 63, a cloth cutting electromagnetic valve 64, a presser switch 65, and a start switch 6.
6 and a power supply 61 for supplying power to the electrical box 50.

The power supply 61 is, for example, 100 V (volt).
Alternatively, the power supply 61 is connected to a 200 V AC power supply.
The power is supplied to the transformer 51 mounted on the electrical component box 50 from.

The power supplied from the power supply 61 is the transformer 5
The signal is converted into a predetermined voltage value by 1 and supplied to the power supply board 52. The power supply board 52 further transforms or rectifies the power supplied through the transformer 51 and supplies the power to the CPU board 54. Power is also supplied from the power supply substrate 52 to the servo substrate 53.

The servo board 53 is connected to the CPU board 54 and supplies power to the upper axis servo motor 47 of the circuit 40 under the control of the CPU board 54,
Drive. The upper shaft servomotor 47 is a servomotor that drives the upper shaft of the buttonhole sewing machine. The needle shaft 6 and the like of the buttonhole sewing machine are driven by using the upper shaft servomotor 47 as a power source.

The CPU board 54 has a CPU (Central Proc).
essing Unit), and operates based on the power supplied from the power supply board 52,
Each device connected to the CPU board 54 is controlled. Specifically, the CPU board 54 drives the presser solenoid valve 62 in accordance with the operation of the presser switch 65 to move the cloth presser 8 (see FIG. 2) up and down. Further, the CPU board 54 controls the servo board 53 in accordance with the operation of the start switch 66, and controls the drive of the upper axis servomotor 47.

The CPU board 54 includes an operation panel 55
In accordance with the input operation in the above, each part is controlled based on various data, and after the button hole is formed by the cloth cutting knife 7, the straight knife part, the straight knife part, the straight knife part, and the straight knife part which form the straight bar part,
After forming the eyelet part and the straight bar part, the button hole is formed with the cloth cutting knife 7. After forming the straight part and the eyelet part, the button hole is formed with the cloth cutting knife 7, and then the straight bar part is formed. Buttonhole sewing by one of the intermediate knife drives to be performed.

Further, the CPU board 54 controls the cloth cutting solenoid valve 64 in the control of the predetermined buttonhole buttonhole sewing.
Then, the cloth opening electromagnetic valve 63 is appropriately driven to form a cut portion of the sewing object and perform the cloth opening operation. CPU board 54
Is based on detection signals input from the X origin sensor 41, the Y origin sensor 42, and the θ origin sensor 43.
The X-pulse motor 44 and the Y-pulse motor 45 are driven to move the feed bar 10 to a predetermined position while detecting the zero position and the rotation position of the needle bar 6, and the needle bar 6 is moved to a predetermined rotation position. The θ pulse motor 46 is driven to move.

Further, various storage elements (not shown) such as a flash memory are mounted on the CPU board 54.
In this storage element, various data are stored in addition to various programs executed when the CPU board 54 operates. Then, in response to an input operation on the operation panel 55, the CPU board 54 performs a data setting process described later (FIG. 9).
To set / change the data in the storage element.
Here, patterns 56, 56,... Will be described as an example of data stored in the storage element.

FIG. 5 shows patterns 56, 56,... Stored in storage elements (not shown) mounted on the CPU board 54.
It is a figure which shows the structure of FIG. As shown in the figure, patterns 56, 56,... Constitute a table in which data is set in association with a plurality of items each having an item number.

FIG. 6 shows the pattern 5 shown in FIG.
It is a top view which shows buttonhole buttonhole sewing formed based on 6,56, .... As shown in FIG. 6, according to the buttonhole overlock sewing machine according to the embodiment, a cut portion is formed in a sewing product, and an eyelet portion, a straight portion, and a straight bar portion are formed around the cut portion. Three types of stitches are formed.

In the patterns 56, 56,... Shown in FIG.
Item No. 1 shows the length of the straight part in the buttonhole buttonhole sewing, Item No. 2 shows the number of stitches when sewing the straight part, Item No. 3 shows the shape of the cut part by the cloth cutting knife 7,
Item number 4 indicates the presence or absence of a straight bar, and item number 5 indicates the operation timing of the cloth cutting knife 7. Here, since the data of the item number 1 is 22, if the buttonhole buttonhole sewing is performed according to the pattern 56 shown on the near side in FIG.
The straight portion shown in FIG. 6 is sewn with a length of 22 mm.

If the value 1 indicates that there is a straight bar portion and the value 2 indicates that there is no straight bar portion as the data of the item number 4, the buttonhole sewing is performed in accordance with the pattern 56 shown on the front side in FIG. Then, the sewing of the straight bar portion shown in FIG. 6 is formed. Further, as the data of item No. 5, if the value 1 indicates the first knife drive described later, the value 2 indicates the second knife drive, and the value 3 indicates the intermediate knife drive, the buttonhole is formed according to the pattern 56 shown on the near side in FIG. When the overlock sewing is performed, the intermediate knife drive is performed.

As described above, since various data in the buttonhole buttonhole sewing are set in each of the patterns 56, 56,..., The sewing is performed based on different patterns, so that the operation at the time of sewing, The size and shape of sewing of each part shown in FIG. 6 can be changed.

The CPU board 54 is connected to the X origin sensor 41, the Y origin sensor 42, and the θ origin sensor 43 of the circuit 40. Each of these sensors is a sensor for detecting a predetermined origin position.
Indicates the origin position of the feed bar 10 in the X-axis direction, the Y origin sensor 42 detects the origin position of the feed bar 10 in the Y-axis direction, and the θ origin sensor 43 indicates the origin position in the rotation of the needle bar 6. Is a sensor that detects Each of these sensors outputs a detection result to the CPU board 54.

Further, an X pulse motor 44, a Y pulse motor 45, and a θ pulse motor 4
6 is connected. The X pulse motor 44 is connected to the feed base 1
0 is a pulse motor for moving in the X-axis direction, a Y pulse motor 45 is a pulse motor for moving the feed base 10 in the Y-axis direction, and a θ pulse motor 46 is used for sewing, for example, an eyelet of a buttonhole. A pulse motor for rotating the needle bar 6 and a looper (not shown). Each of these pulse motors operates under the control of the CPU board 54 to move the feed bar 10 or rotate the needle bar 6 and the looper during sewing.

The holding solenoid valve 62 is connected to the holding driving body 19.
(See FIG. 2), which is an electromagnetic valve for controlling the supply of air from an air supply source (not shown) to an air cylinder provided in the pressing driving body 19,
It opens and closes according to the control by. The rod 19a expands and contracts with the opening and closing of the presser solenoid valve 62, and
Move up and down.

The cloth opening solenoid valve 63 is a solenoid valve for controlling air supply from an air supply source such as a compressor (not shown) to the air cylinder 36 (see FIG. 3).
It is connected to the PU board 54 and opens and closes under the control of the CPU board 54. Then, with the opening and closing of the cloth opening electromagnetic valve 63, the piston rod 36a of the air cylinder 36 (see FIG. 3).
Is moved back and forth, the cloth opening means 21 (see FIG. 3) operates.

The direction in which the cloth opening means 21 is operated by operating the cloth opening electromagnetic valve 63 is a direction perpendicular to the linear portion of the button hole and opening or closing the cut portion of the sewing object. In the present embodiment, the state in which the cloth opening operation is performed by the cloth opening means 21 is referred to as the open state of the sewing object, and the state in which the cloth opening means 21 does not open the cloth is referred to as the sewing object. In a closed state.

The cloth cutting solenoid valve 64 controls the operation of the cloth cutting knife 7 (see FIG. 1) by controlling the air supply from an air supply source (not shown) such as a compressor to an air cylinder (not shown). Solenoid valve. The cloth cutting solenoid valve 64 is connected to the CPU
It opens and closes according to the control of. Then, with the opening and closing of the cloth cutting electromagnetic valve 64, the cloth cutting knife 7 is driven, and a cut portion is formed.

The presser switch 65 is a switch for instructing the movement of the cloth presser 8 to start / cancel the press of the work to be sewn. The valve 62 is controlled to operate the presser foot 8.

The start switch 66 is a switch for starting / stopping the operation of the buttonhole sewing machine.
The PU board 54 controls the servo board 53 according to the operation of the start switch 66 to start / stop the rotation of the upper axis servomotor 47.

The operation panel 5 is provided on the CPU board 54.
5 is connected. The operation panel 55 is an input unit for performing various settings relating to the operation of the buttonhole sewing machine in a data setting process described later, and is disposed, for example, in front of the sewing machine frame 1. Here, the operation panel 55 will be described with reference to FIG.

FIG. 7 is a front view of the operation panel 55.
As shown in FIG.
2, mode selection switch 76, pattern No. -(Minus) switch 78, pattern No. + (Plus) switch 79, data-(minus) switch 81, data +
(Plus) switch 82, data setting switch 83, item- (minus) switch 85, and item + (plus)
Switches 86 and the like, LEDs 71, 73, 74, and 75 arranged near these switches, and pattern Nos. Each display unit includes a display unit 77, a numerical value display unit 80, and an item number display unit 84. Each of the switches is a switch that detects a pressing operation and outputs a detection signal to the CPU board 54. -Switch 78, data-switch 81, and item-switch 8
When the operation of pattern No. 5 is performed, the corresponding value is decreased by 1, and the pattern No.
When the + switch 79, the data + switch 82, and the item + switch 86 are operated, the corresponding values are increased by one. Each of the display units includes a plurality of light sources such as LEDs and EL elements, or a liquid crystal display panel, and can display numerical values and the like.

The preparation switch 72 is a switch for designating a preparation state for performing generation of stitch data prior to sewing, movement of the feed bar 10, the needle bar 6, and a looper (not shown) to the origin position, and the like. While the preparation state is instructed by the operation of the switch 72, the LED 71 arranged adjacent to the preparation switch 72 lights up, indicating that the preparation for sewing is completed and the sewing operation of the sewing machine can be started. I have.

The mode selection switch 76 is a switch for selecting a plurality of operation modes executable by the buttonhole sewing machine. As an example, in this embodiment, an automatic mode in which cloth feeding and sewing are automatically performed, a manual mode in which an operation in the same procedure as the automatic mode is performed by manually rotating the upper shaft, and a mode in which sewing is not performed. It is possible to set three kinds of operation modes of a feed mode in which only the feed of the sewing object is performed. In the vicinity of the mode selection switch 76, LEDs 73, 74, and 75 indicating the selection states of the above three types of operation modes are arranged. When the operation mode is switched by operating the mode selection switch 76, the LED corresponding to the newly selected operation mode is turned on.

The pattern No. Switches 78 and patterns
No. The + switch 79 is a switch for switching the patterns 56, 56,... Relating to the buttonhole sewing of the buttonhole sewing machine. As described above, in the buttonhole sewing machine according to the present embodiment, the CPU board 54
(See FIG. 4) In the memory element mounted above, various data referred to at the time of buttonhole buttonhole sewing are stored in the patterns 56 and 5.
6,... (See FIG. 5). Then, by specifying a predetermined pattern when performing the buttonhole sewing, the sewing is performed in accordance with the data set in the pattern.

The pattern No. Switches 78 and patterns
No. The + switch 79 sets the patterns 56 and 5 to be referred to.
A switch for designating 6, ... and the pattern N
o. -Switch 78 and pattern No. + No. of the pattern specified by the operation of switch 79 Is the pattern No.
It is displayed on the display unit 77. Pattern No. The display unit 77
Pattern No. -Switch 78 and pattern No. No. of the pattern designated by the operation of the + switch 79 Is displayed. The pattern No. The pattern No. displayed on the display unit 77 is displayed. Is referred to at the time of the sewing operation, and becomes a data update target on the operation panel 55.

The data-switch 81 and the data + switch 82 correspond to the pattern No. A switch for setting / changing data corresponding to each item number of the pattern displayed on the display unit 77. The value of data changed by operating the data-switch 81 and the data + switch 82 is displayed on the numerical value display unit 80. Will be displayed. In addition, the numerical value display part 80
Pattern No. In addition to displaying the data of the pattern displayed on the display unit 77, when executing the sewing operation, the sewing speed,
The count value of the production counter is displayed.

The data setting switch 83 sets the pattern No.
A switch for instructing setting / updating of the data of the pattern displayed on the display unit 77. That is, the pattern No. In the pattern displayed on the display unit 77, a switch for storing the value displayed on the numerical value display unit 80 as the data of the item number displayed on the item number display unit 84 described later, and the data setting switch 83 is operated. By doing
The data set / changed by the data-switch 81 and the data + switch 82 is determined.

Item-switch 85 and Item + switch 8
Reference numeral 6 denotes a switch for designating an item number to be set / changed by the data-switch 81 and the data + switch 82. The item number designated by the item-switch 85 and the item + switch 86 is the item number. It is displayed on the number display section 84.

The operation of the buttonhole sewing machine configured as described above will be described with reference to FIGS. FIG. 8 is a general flow showing an operation of the buttonhole sewing machine in the present embodiment.

First, in step S 1, the CPU board 54 reads the pattern No. on the operation panel 55. -Switch 78
And pattern No. It is determined whether or not the + switch 79 has been operated. If the switch operation has been performed, the process proceeds to step S2, and the pattern No. to be processed is set.
Is updated, and the updated pattern No. To the pattern No. The display is displayed on the display unit 77 and the process proceeds to step S3. If it is determined in step S1 that there is no switch operation, the process directly proceeds to step S3.

In step S3, the CPU board 54 determines whether or not the mode selection switch 76 of the operation panel 55 has been operated. Here, when the mode selection switch 76 is operated, the process proceeds to step S4, the mode designated by the operation of the mode selection switch 76 is set as the operation mode, and the process proceeds to step S5. If the mode selection switch 76 has not been operated in step S3, the process proceeds to step S5.

In step S5, it is determined whether or not the currently set operation mode is the automatic mode. If the manual mode or the feed mode is set, the process proceeds to step S5.
Then, the process proceeds to step S6, the operation corresponding to the set operation mode is performed, and the process ends. If the automatic mode is set as the operation mode in step S5,
The CPU board 54 proceeds to step S7.

In step S7, the CPU board 54 determines whether or not the data-switch 81 and the data + switch 82 have been operated. Here, when the switch operation is performed, the process proceeds to step S8 to execute a data setting process described later, and then proceeds to step S9. In step S7, the data-switch 81 and the data + switch 8
If none of the two is operated, the CPU board 5
No. 4 proceeds directly to the processing of step S9.

In step S9, it is determined whether or not the preparation switch 72 has been operated. If the preparation switch 72 has been operated, the LED 71 is turned on, and the process proceeds to step S10. If the preparation switch 72 has not been operated, the process returns to step S1.

In step S10, the CPU board 54 displays the set pattern No. Stitch data to be sewn is created based on the above data. Further, the CPU board 54
In step S11, X pulse motor 44, Y
The drive of the pulse motor 45 and the θ pulse motor 46 is controlled to move the feed bar 10 to the origin position, and the needle bar 6 and a looper (not shown) to the origin position.
Here, the origin positions of the X pulse motor 44 and the Y pulse motor 45 are positions based on the position of the cloth cutting knife 7.

In the following step S12, CPU board 54
Determines the operation state of the preparation switch 72 of the operation panel 55, and if the preparation switch 72 is operated, turns off the LED 71 and returns to step S9. Then, step S12
If the preparation switch 72 is not operated, the CPU board 54 proceeds to step S13.

In step S13, the CPU board 54 determines whether or not the presser switch 65 has been operated, and
If No. 5 is not operated, the process returns to step S12 and waits.
When the presser foot switch 65 is operated, the process proceeds to step S14, where the work clamp 8 is lowered to fix the work.

In step S15, the CPU board 54 again determines whether or not the presser switch 65 has been operated. If the presser switch 65 has been operated, the process proceeds to step S16, where the cloth presser 8 is raised, and step S13 is performed. Return to If the presser switch 65 has not been operated in step S15, the CPU board 54 proceeds to step S17.

In step S17, the CPU board 54 determines whether or not the start switch 66 has been operated. If no operation has been performed, the process returns to step S15.
Is operated, the process proceeds to step S18.

In step S18, the CPU board 54 displays the currently set pattern No. It is determined whether or not the operation timing of the cloth cutting knife 7 is the data indicating the leading knife driving with reference to the data of FIG. Specifically, the patterns 56, 56,.
(See FIG. 5). The pattern No. currently displayed on the display 77 (see FIG. 7). It is determined whether or not the value of the data is “1” by referring to the data set in the item number 5 of the pattern corresponding to. If the value of the data is “1” and the first knife drive is set, the process proceeds to step S19.

In step S 19, the CPU board 54 drives the cloth cutting electromagnetic valve 64 so that the cloth cutting knife 7
(See FIG. 1) to make a cut in the sewn object, and the process proceeds to step S20. Step S1
If the value of the data is not “1” in the determination at 8 and the first knife drive is not set, the CPU board 54 proceeds to step S20 without performing the processing of step S19.

In step S20, the CPU board 54 moves the feed base 10 to the position where sewing is started, and then proceeds to step S2.
In step 1, the cloth opening means 21 is operated by driving the cloth opening electromagnetic valve 63 to open the cloth.

Then, in step S22, the CPU
The board 54 controls the servo board 53 to drive the upper axis servomotor 47 and the X pulse motors 44 and Y
The pulse motor 45 and the θ pulse motor 46 are controlled to execute the sewing of the linear portion and the eyelet portion.

Subsequently, the CPU board 54 proceeds to step S2.
3, the currently set pattern No. It is determined whether or not the operation timing of the cloth cutting knife 7 is data indicating the intermediate knife driving by referring to the data corresponding to. Specifically, among the patterns 56, 56,. The pattern No. currently displayed on the display unit 77 It is determined whether or not the value of the data is “3” by referring to the data set in the item number 5 of the pattern corresponding to. If the value of the data is "3" and the intermediate knife drive is set, the CPU board 54 proceeds to step S24, and moves the feed base 10 to the origin position, that is, the position of the cloth cutting knife 7. Let
Move to step S25.

In step S25, the CPU board 54 drives the cloth cutting knife 7 to form a cut in the sewing object, and proceeds to step S26. In step S26,
The feed bar 10 is moved to a position where sewing of the straight bar portion starts. In a succeeding step S27, the CPU board 54 operates the cloth opening means 21 to terminate the cloth opening, and shifts to a state where the sewing object is not spread.

Here, the CPU board 54 determines in step S2
8 and the sewing of the straight bar portion is executed.
Move to 9. In the determination in step S23, if the value of the data of the item number 5 of the pattern is not “3”, that is, if the intermediate knife drive is not set, the process proceeds from step S23 to step S100. In step S100, the presence / absence of straight bar data is determined. If straight bar data is present, the process proceeds to step S28, where the straight bar portion is sewn.
Move to step S29.

In step S29, the CPU board 54 displays the currently set pattern number. It is determined whether or not the operation timing of the cloth cutting knife 7 is data indicating the rear knife driving by referring to the data corresponding to. Specifically, the pattern 56,
Among the pattern Nos. The pattern No. displayed on the display unit 77 is displayed. It is determined whether or not the value of the data is “2” by referring to the data set in the item number 5 of the pattern corresponding to. If the value of the data is "2" and the rear knife drive is set, the CPU board 54 proceeds to step S31 to drive the cloth cutting knife 7 to form a cut portion of the sewing object. Then, the process proceeds to step S32. In step S32, the CPU board 54 operates the cloth opening means 21 to terminate the cloth opening, and makes the sewing object unspread.

After the processing in step S32 is completed, C
The PU substrate 54 returns to Step S12. If it is determined in step S30 that the rear knife drive has not been set as the operation timing of the cloth cutting knife 7,
The process returns from step S30 to step S12.

As described above, in the above-described intermediate knife driving, after the linear portion and the eyelet portion are sewn, the cloth cutting knife 7 is driven to form the cut portion, and then, after the cloth opening is closed, the cut portion is directly formed. A bar is formed. For this reason, a straight bar portion can be formed so as to straddle the edge of the cut portion, and fraying can be prevented. Further, since the straight bar portion is formed after the cloth opening means 21 shifts to the state in which the cloth is closed, there is no risk of distortion near the straight bar portion.

Next, the data setting process shown in step S8 of FIG. 8 will be described in detail with reference to FIG. In the processing shown in FIG. 9, the CPU board 54 first sets "1" to a parameter called "data item number" (step S41). The data item number is a parameter for designating the item number in the patterns 56, 56,...

Subsequently, the CPU board 54 determines whether or not the data-switch 81 and the data + switch 82 have been operated (step S42). Data switch 81
If either or both of the data and switch 82 or both are operated, the process proceeds to step S43 for updating the data because the data has been changed. When neither the data-switch 81 nor the data + switch 82 is operated, the CPU board 54 proceeds to step S44 described later.

In step S43, the value of the currently specified item number, that is, the data of the item number displayed on the item number display section 84, is changed by operating the data-switch 81 and the data + switch 82. Set and update. The data updated in this step S43 is provided at the time of sewing of the straight portion in order to form the cut portion by the cloth cutting knife 7 with the length of the hole in the straight portion, the number of needles in the straight portion, the number of needles in the eyelet portion, and the cloth cutting knife 7. Similarly, there are a straight part female space indicating room to be provided, an eyelet female space provided at the time of sewing the eyelet part, presence / absence of a straight bar part, the number of stitches of a straight bar part, and the like.

Then, the CPU board 54 proceeds to step S4
4 to determine whether or not the item-switch 85 and the item + switch 86 have been operated. If the operation has been performed, the process proceeds to step S45, where the item-switch 85 is selected.
Then, the item number specified by the operation of the item + switch 86 is set and updated as a new data item number, and the process proceeds to step S46. Step S4
In step 4, if neither the item-switch 85 nor the item + switch 86 is operated, the process directly proceeds to step S46.

In step S46, it is determined whether or not the data setting switch 83 has been operated. If the operation has been performed, the process proceeds to step S47, where the data setting switch 83 is operated.
If is not operated, the process returns to step S42.

In step S47, the CPU board 54
By referring to the data of the item indicating the drive timing of the cloth cutting knife 7, it is determined whether or not the value of the data is "0". And
If the value of the data is "0", the process proceeds to step S48, where the setting that the cloth cutting knife 7 is not driven is performed, and then the process proceeds to step S49. If the value of the data is not “0” in step S47, the process proceeds to step S48.
The process moves to step S49 without performing the process of.

In step S49, the CPU board 54 refers to the data of the item indicating the drive timing of the cloth cutting knife 7, and determines whether or not the value of the data is "1". If the value of the data is "1", the flow shifts to step S50 to set the first knife drive, and shifts to step S51.
If the value of the data is not “1” in step S49, the process proceeds to step S51 without performing the process in step S50.

Then, in a step S51, the CPU substrate 5
4 refers to the data of the item indicating the drive timing of the cloth cutting knife 7 and determines whether or not the value of the data is “2”. If the value of the data is "2", the flow shifts to step S52 to set the rear knife drive, and shifts to step S53. If the value of the data is not “2” in step S51, the process proceeds to step S53 without performing the process in step S52.

In step S53, the CPU board 54 refers to the data of the item indicating the drive timing of the cloth cutting knife 7, and determines whether or not the value of the data is "3". If the value of the data is "3", the process proceeds to step S54, where it is determined whether straight bar sewing is set or not by referring to the data relating to the sewing of the straight bar portion.

As a result of the determination in step S54,
When it is determined that the data indicating that the straight bar sewing is to be performed is not set, the CPU board 54 proceeds to step S55, sets the drive timing of the cloth cutting knife 7 to the rear knife drive, and sets the data value to “ 2 ", and the process returns to step S47. If it is determined in step S54 that the data indicating that straight bar sewing is to be performed is set, the process proceeds to step S56 to set an intermediate knife, and then proceeds to step S57.

In the determination in step S53, the value of the data indicating the operation timing of the cloth cutting knife 7 is "3".
If not, the CPU board 54 proceeds directly to step S57.

In step S57, step S47
Update of data other than the data according to Step S56 is performed, and the process returns to Step S9 (FIG. 8).

As described above, in the intermediate knife drive, after the linear portion and the eyelet portion in the buttonhole buttonhole sewing are sewn, the cloth cutting knife 7 is driven to form a cut portion, and then the straight bar portion is sewn. Is the way. Therefore, if the sewing of the straight bar portion is omitted in the intermediate knife drive, the same operation as that of the rear knife drive is performed. Therefore, if the setting is made such that the straight bar portion is not sewn while the intermediate knife is set by the processing shown in steps S54 and S55 in FIG. 9, the operation timing of the cloth cutting knife 7 is changed to the rear knife. , So that there is no unnecessary confusion or error.

As described above, in the buttonhole buttonhole sewing machine according to the embodiment of the present invention, when forming the buttonhole buttonhole seam, after forming the buttonhole with the cloth cutting knife 7, the linear portion, the eyelet portion and the straight portion are formed. In addition to the front knife drive for forming the bar portion, the straight knife portion, the eyelet portion and the straight knife portion, and then the knife drive for forming the button hole with the cloth cutting knife 7 and then the knife drive,
After forming the linear portion and the eyelet portion, a button hole is formed by the cloth cutting knife 7, and thereafter, an intermediate knife drive for forming a straight bar portion can be performed. For this reason, it is possible to form a straight portion first, perform overlock sewing of a button hole without distortion, and form a straight bar portion so as to straddle the edge of the cut portion,
Buttonhole overlock stitching without any risk of distortion and without fear of fraying can be easily performed.

When the intermediate knife driving is performed, after the button hole is formed by the cloth cutting knife 7 and before the straight bar portion is formed, the cloth opening means 21 is driven so that the cloth is not opened. That is, the sewing object is closed. For this reason, when forming the straight bar portion, the workpiece is not opened,
No distortion occurs when the straight bar is formed.

Further, in the data setting process shown in FIG. 9, when the intermediate knife drive is set, the data indicating the presence or absence of the straight bar portion is referred to. Since the rear knife drive is set instead of the intermediate knife drive, inconsistent data is not set, operation errors and unnecessary confusion are avoided, and stable use is possible.

In the above-described embodiment, if the setting in step S54 and step S55 in FIG. 9 is performed such that the straight bar portion is not sewn while the intermediate knife is set, The operation timing of the cloth cutting knife 7 is set as the rear knife drive. However, the present invention is not limited to this. Only the operation at the time of sewing is performed with the rear knife while the data to be set remains the intermediate knife. The operation may be changed to the same operation, and in addition, it is needless to say that the detailed configuration of each part of the buttonhole sewing machine can be appropriately changed. Further, in the above embodiment, the eyelet buttonhole overlocking machine was described. However, the same effect can be obtained for a buttonhole overhole sewing machine that forms a seam only in the linear portion and the bar-tacking portion without forming the eyelet buttonhole. Of course, it can be done.

[0101]

According to the first aspect of the present invention, since the straight portion is formed before the button hole is formed, there is no possibility that the straight portion is distorted, and the bar-tacking portion is formed after the button hole is formed. Is formed, the seam of the bar-tacking portion can be formed so as to straddle the edge of the button hole. Therefore, a beautiful buttonhole stitch without fraying or distortion can be easily formed.

According to the second aspect of the present invention, when the cloth is opened by the cloth opening means to form the seam of the linear portion or the eyelet portion, and then the seam of the bar-tacking portion is formed,
Since the cloth is in the closed state, it is possible to prevent the button holes from spreading, and there is no possibility that the seam at the bar-tacking portion will be distorted. For this reason, a more beautiful buttonhole stitch can be easily formed.

According to the third aspect of the present invention, any one of the first knife drive, the second knife drive, and the middle knife drive can be set, so that it is easy to set a desired knife drive timing in advance. You can form a beautiful buttonhole seam. In addition, if the setting of the knife drive timing does not match the presence or absence of the bar-tacking section, the operation of the rear knife drive is performed automatically. Can be advanced promptly.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a buttonhole sewing machine according to an embodiment of the present invention.

FIG. 2 is a side view showing a cloth presser mechanism provided in the buttonhole overlock sewing machine shown in FIG. 1;

FIG. 3 is a plan view showing a cloth opening device provided in the buttonhole sewing machine shown in FIG. 1;

FIG. 4 is a block diagram showing a configuration of a control system of the buttonhole sewing machine shown in FIG. 1;

FIG. 5 is a diagram schematically showing a configuration of a pattern stored in a CPU substrate shown in FIG. 4;

FIG. 6 is a plan view showing a buttonhole buttonhole sewing formed by the buttonhole buttonhole sewing machine according to the embodiment of the present invention.

FIG. 7 is a front view showing the configuration of the operation panel shown in FIG. 4 in more detail;

8 is a general flow chart showing processing executed by a control system of the buttonhole sewing machine shown in FIG.

FIG. 9 is a flowchart showing the data setting process shown in step S8 of FIG. 8 in more detail.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Control system 40 circuit 41 X origin sensor 42 Y origin sensor 43 θ origin sensor 44 X pulse motor 45 Y pulse motor 46 θ pulse motor 47 Upper axis servo motor 50 Electrical box 51 Transformer 52 Power supply board 53 Servo board 54 CPU board 55 Operation Panels 56, 56, ... Pattern 61 Power supply 62 Holding solenoid valve 63 Cloth opening solenoid valve 64 Cloth cutting solenoid valve 65 Holding switch 66 Start switch

Continued on the front page F term (reference) 3B150 AA24 BA06 CB03 CE01 CE03 CE07 EE03 EE08 GG02 JA07 JA08 JA13 LA16 LA26 LA71 LA73 LA89 LB01 LB02 NA15 NA25 NA28 NA76 NA78 NB03 NB12 NB18 NC06 NC07 NC18 QA01 QA06 QA07 QA08

Claims (3)

[Claims] An electric control forms a buttonhole stitch formed by at least a left and right straight portion and a bar tack portion formed at one end of both straight portions.
In a buttonhole overlock sewing machine that forms a buttonhole between the two linear portions with a cloth cutting knife, after forming a stitch on the both linear portions, the buttonhole is formed with the cloth cutting knife, and thereafter, a bar tacking portion is formed. A buttonhole sewing machine, further comprising control means for forming a seam on a buttonhole sewing machine. 2. The buttonhole overlocking machine further comprises cloth opening means for opening and closing the cloth in a direction perpendicular to the buttonhole formed by the cloth cutting knife, and wherein the control means closes the cloth by the cloth opening means. 2. The buttonhole buttonhole sewing machine according to claim 1, further comprising cloth opening control means for forming a seam in the bar-tacking portion in a state. 3. The control means includes: a first knife drive for forming a seam on both the linear portion and the bar-tacking portion after forming the button hole by the cloth cutting knife; and a seam on the both linear portion and the bar-tacking portion. After forming the button hole by the cloth cutting knife after the formation of the button hole, the intermediate between forming the button hole by the cloth cutting knife after forming the seam on the both linear portions, and then forming the seam on the bar-tacking portion Knife driving order setting means for setting any one of knife driving; and bar-tacking presence / absence setting means for setting whether or not a seam is formed in the bar-tacking portion. Is set as
And, when the intermediate knife drive is set by the knife sequence setting means, it is assumed that the rear knife drive is automatically set, and the cloth cutting knife is formed after forming the buttonhole buttonhole stitch of the linear portion. 2. The buttonhole overlock sewing machine according to claim 1, further comprising a non-coincidence setting control means for driving the buttonhole to form a buttonhole.